Listing



July 28, 1936. p, CROSMAN 2,048,842

LISTING ADDING MACHINE Filed Dec. 21,1935 2 Sheets-Sheet 1 'Pa, 9'. I

an O 0 GD y I i Q INVENTOR.

Q Y, I ;or'2n9PC/osqmn a \W/ ATTORNEY.

July 28, 1936. CRQSMAN 2,048,842

LISTING ADDING MACHINE Filed Dec'. 21, 1935 2 Sheets-Sheet 2 INVENTOR.

Log ing CFOJQIEUL Mm ATTORNEY.

Patented July 28, 1936 UNITED STATES PATENT OFFICE LISTING ADDING MACHINE Application December 21, 1935, Serial No. 55,576

1Clalm.

The invention relates to listing adding machines, and more particularly to total and grand total printing mechanism therefor.

The invention consists in the novel construction and combination of parts, as set forth in the appended claim, and it is designed to provide for the accumulation of items; for the taking of totals and accumulation of the grand total, under control of the total key mechanism, all without manual readjustment of any control for selecting the particular accumulators to be operated, and for the taking for a grand total (after setting of a special control) upon operation of the total key.

In the accompanying drawings, illustrating the invention:

Fig. l is a left side elevation of an adding machine to which the invention has been applied, with the casing removed.

. Fig. 2 is a fragmentary plan view of the keyboard.

Fig. 3 is a detail right side elevation of the accumulator control mechanism.

The invention is shown as applied to a Gardner listing adding machine containing a transfer total mechanism such as that disclosed in co-pendlng application, Serial No. 10,271, flied on March 9, 1935 by Loring P. Crosman, and entitled Registers. 3o Machines of this type are provided with a plurality of accumulators 412, (Fig. 3) to which amounts set up on the keyboard are transferred by means of reciprocatory segmental racks H0. The gears of the desired accumulator are meshed with the racks 610 during the counterclockwise movement of said racks to effect subtraction, and are meshed during the return or clockwise movement of the racks to effect addition.

The accumulators are engaged with the racks 40 by means of cams 453, 455, fast upon the respective accumulator shafts, in cooperation with cams 452, mounted upon the frame of the machine, engagement of a cam 452 with a cam 452 serving to move the shaft 403 of an accumulator 413 45 along suitable guide slots of the framing against the tension of suitable springs, to effect the meshing. The cams 452, I are adjusted through the shafts 403 to determine whether a given accumulator shall be operative or shall remain idle. 5o Cams 452 are formed upon rocking plates 4", "I having a pin and slot connection with each other at ll, the plate 9 being connected by means of a link HI and am 222 with a rocker 225. The rocker 325 is controlled by rock shaft ill, which is is moved in time with the racks ill, and serves Total printing Totals are printed, as is usual in machines of this type by engaging one of the accumulators with the racks N0 and allowing these racks to move subtractively until the accumulator is stopped at zero, thus entering the total on the racks and thereby on the type bars of the machine. The printing hammers are then released, the accumulators disengaged from the racks, and the parts restored to normal position.

In the combination employed in the present invention, a total cleared from the upper accumulator 413 is transferred to the lower accumulator, this being effected in the preferred construction by means described in co-pending application, Serial No. 10,271.

A total key 210 is provided with a shoulder engaging a pin 252 fixed in a plate 226, pivoted concentrically with the rocker 325, depression of the total key moving the plate 326 clockwise as viewed in Fig. 3, to disable the rear cam follower, to withdraw a shoulder-of the plate from the rear face of a pin in the upper end of the forward cam follower, and to bring a second shoulder of said plate in front of the pin. In this position of the parts the cam arm 320 will rock the forward cam follower idly about its pivot during the subtractive stroke of the racks Sill, leaving the cams 452 in the positionshown in Fig. 3, wherein it will be noted that the upper accumulator 473 is held up against the racks ill while the lower accumula- .tor remains in its forward or idle position. At the end of the forward stroke of the racks, the

forward cam follower will escape from the rear end of cam 320, so that upon the return stroke of the parts this cam follower, held by the shoulder of the plate 320, will move the rocker 325 clockwise, and thereby move the plates 9, 42! so that the upper cam 452 is moved, downwardly out of contact with the cam 453, allowing the upper accumulator to move out of meshing engagement with the racks during the additive stroke.

The lower accumulator 473 is thrown into mesh with the racks "I during the additive stroke thereof by the following means:

- cumulator.

Upon depression of the total key 218, apin I3, fixed in the key lever will engage a pawl 12 mounted upon an arm I0, nxed upon a shaft 52. A second arm, II is also fast upon shaft 82, this arm being connected, by a link I4, with a latch I5. Latch I5 is pivoted upon a plate I5 which is in turn pivoted concentrically with the plate 4" and is provided with a cam face II. Depression of key 218 will therefore rock shaft 52 in a clockwise direction as viewed in Fig. 3, and arm 'II will act to engage the latch II with the pin 11 of the plate 9, holding the plate 4i. and the plate It in fixed relation, for operation in unison. Thus, at the beginning of the additive stroke of the racks BIO, the upward rocking movement of plate 8, effected by the readjustment of rocker 325, will bring the cam face II in contact with a collar of the lower shaft 403, and will thereby force the lower accumulator into mesh with the racks 6 I0, whereby the total, which has been transferred to the racks from the upper accumulator will be added into the lower accumulator during the return stroke of said racks.

Grand total printing At the end of a series of operations, it will be desired to print the grand total which has been accumulated from time to time on the lower accumulator, for which purpose, according to the present invention, the upper accumulator is moved to inactive position, the lower accumulator is thrown into mesh with the racks II at the beginning of the operation, and the transfer total mechanism is disabled, the total then being printed and the lower accumulator cleared in the usual manner.

It is designed that a grand total shall be taken by means of the total key 213, in cooperation with a grand total control lever l (Figs. 1 and 2). Preferably lever I is a spring retracted member, and must be held in active position by the operator until the total key is depressed, this method of operation serving'to prevent inadvertent clearing of the grand total on the lower ac- Lever I is fulcrumed on the frame of the machine at 2, and is provided with a retraction spring 8i. In moving from neutral to active position, a pin 82 in grand total lever I will engage and displace a pin 33, fixed in a yieldable slide plate 84. Slide plate 84 extends across the front of the machine as seen in Fig. 2, and is provided at its right hand end with a lug 85, adapted upon displacement of plate 84 by lever I to move beneath a shoulder 85 of the total key 218, thus serving to lock the total key in inoperative position while the lever I remains in partially adjusted position. Grand total lever I having been fully moved to active position, the depression of total key 214 will bring the shoulder 86 into the path of movement of lug II of plate 44, and the grand total lever will remain locked in active position so long as the total key remains depressed.

Movement of lever I to active position will effect the proper setting of the upper and lower accumulators, by means of a roller 4, fixed in the lower end of lever I, and engaging a cam wall I of a segment 8, pivoted at I to the framing of the machine. Segment 8 has rack teeth engaging pinions 414, fixed upon shafts which are provided with universal Joint connections with the accumulator shafts 4. Therefore, rearward movement of lever I, into its active position, will raise the segment 8 and effect clockwise movement of the pinions 414, as viewed in Fig. 1, this movement corresponding to a third of a rotation in a counterclockwise direction of the earns 45!, 455, as viewed in Fig. 3. As will be observed in Pig. 3, this rotation of cams 453, 455 will allow the upper accumulator to drop out of mesh with the racks III and, through engagement with the cams 455 and 452, will forcethe lower accumulator into mesh with said racks.

Rearward movement of lever I will disable the transfer total mechanism by means of a pin I'I, fixed in the lever I and normally forming a stop for a spring arm 58, fast upon the shaft 82. Forward movement of lever I will move pin 81 away from the shaft 52, the spring of arm 55 thereupon rocking shaft 01 in a clockwise direction as viewed in Fig. l, or counterclockwise as viewed in Fig. 3, thus moving the pawl 12 from position under the pin II of the total key.

'I'herefore, in the grand total operation, the upper accumulator 413 will remain idle, while the lower accumulator will be held in operative position until the end of the subtractive stroke of the machine, and will then, owing to the movement of rocker 325, withdrawing cam 452 from engagement with cam 455, be allowed to move into idle position. The operation of the known total printing device has thus taken a total from the lower accumulator, instead of taking it from the upper accumulator as in transfer total operations.

In an illustrative operation of the machine, items may be accumulated in the upper accumulator only, from which totals are transferred from time to time to the lower accumulator, in which such totals are accumulated as a grand total. Obviously, the parts which control the operation of the particular accumulators may be set for other than the above described grand total work, when so desired. For instance, an old balance may be added directly into the grand total accumulator, before the series of operations above described is started.

Grand totals are taken, usually, at infrequent intervals, ordinarily and the present invention provides a machine wherein it will not be necessary to manually adjust the accumulators into or out of active position except when such grand total is taken, and it also provides that both transfer totals and grand totals shall be taken upon operation of the same total key, and total key mechanism.

I claim:

In a listing adding machine having an item accumulator and a grand total accumulator, the combination with a lever, means selectively settable by said lever to render either selected accumulator active, and total printing mechanism including a total key and means operable by said key to take a total from the accumulator which is in active condition, of transfer total means normally operable by the total key to set the grand total accumulator to accumulate a total taken from the item accumulator, and means operable by the lever, in its grand total accumulator selecting position, to disable said transfer total means.

LORING PICKERING CROSMAN. 

